The official voting day is on Tuesday, March 4th and runs from 7am to 7pm. There is then a caucus at 7:15pm for the Democratic party (see below for details). You must vote and caucus at your local precinct on election day. Poll locations for Travis County Poll locations for Williamson County
The primary is open, you select which party you want to vote in when you show up to vote.
If you voted in the Republican primary, all 96 pledged delegates are decided based on the vote alone. The Republican party has a caucus that night at 8pm that you can attend, but it does not allocate pledged delegates.
However if you voted in the Democrat primary, regardless of if you did early voting or day-of voting, you will also need to make sure and go to the caucus. It is held at your precinct voting location at 7:15pm sharp that evening (March 4th). 126 pledged delegates are decided by the primary voting, and 67 pledged delegates will be determined by the caucus. The actual act of "caucusing" is simply showing up at 7pm, signing a form indicating which candidate you support at 7:15pm, and then leaving. So essentially it's the only election where it'll be legal and encouraged to vote twice in the same election. Texas is the only state that has a dual system like this, and most people don't know about it even though the Democratic party has set it up like that for 20 years. More information on the Texas caucus can be found here
Note: "Be sure to bring with you proof that you voted in the Democratic primary. You can either pick up a card from the election judge when you vote, or have your voter registration card stamped at the polling place, or you can hope that your name is already on a county voting list that you voted in the Democratic primary. In any case, it’s important that you can prove to party officials that you really are a Democrat, and that you really did vote."
Obviously I'm a huge Obama fan, if you even look at my website. He's the first candidate that ever really impressed me, that made me excited to vote for that candidate instead of blase about it, or "well he's better than the other guy". He's one of the few politicians who I feel really understand the nuances of the issues instead of just parroting the party line, and that makes it easier to talk to the other side on divisive issues. He also is the first candidate I've seen that sees and calls out how pointless stupid political squabbling is when there are bigger issues to argue about, and that's part of the 'change" he talks about. A change not only of all the failed policies from the Bush years, but also of the way people are involved in the process and in getting politics back to helping people and not special interests and lobbyists.
Obama and Clinton are basically identical in the policy they support, and Hillary presents a false choice when saying he is all words and no detail. It's basically betting that a voter won't actually look for themselves, and finding out that yes, Obama has detailed policy and over 20 years of service, including more time in elected office. He started out after college as a community organizer helping get poor people registered to vote and fighting toxic dumping in their neighborhoods. He then worked as a civil rights lawyer, and got into politics in order to create even further improvements. He also grew up for a few years in Indonesia, and has grandparents in Kenya, so he's got that international exposure from living with a culture instead of just visiting it.
I'm also impressed that his campaign is entirely funded directly by individual Americans, with no special interest groups or anything like that. And that he's been against the Iraq war the entire time and against cluster bombing, two things Hillary cannot claim. And that he is far more electable. There's also a reason many of the congressmen and senators from "Red" states support him, they realize he's their best chance at getting more Democratics elected in Congress.
Finally, the ability to inspire people and get them excited about your policies is very important, and can help bring them to your side to get that legilation passed. His ability to get Democrats, Republicans, and Independents from all walks of life to support him show that his message of hope isn't meaningless words, but the kind of ideas that make this country strong, the hope for a better tomorrow. These two videos show why he has been praised so much for his message of change in politics:
