Lately I've been wondering, if not a Clinton/Obama ticket than who?
There are so many potentials for Vice president, both on the Democratic ticket and the Republican.

Come National Convention time, a presidential nominee will be chosen, a vice presidential candidate will be decided on soon after. A running mate is usually chosen in such a way that the ticket will have a good balance and will grab more of the national vote. This could mean that the VP candidate has a different ideological framework than the potential president (example, if Mike Huckabee was chosen to run with McCain, his high conservative/religious base would help balance McCain's slightly centered foundation ). This could also mean that the VP candidate is from a region of the country, or has support of a region of the country that the presidential nominee does not have strong showings with. The ticket is used as a strategy to appeal to the widest range of voters possible.

The actual nomination occurs at the Party's National Convention. The presidential nominee selects a preferred running mate and the convention delegates almost always select that person.

Here is a few of the possible combinations that have been surfacing, these are the picks that most sites overlapped on:

Democratic-

Hillary Clinton
• Evan Bayh-Senator from Indiana has also served two terms as governor and proved he could win a red state.
• Tom Vilsack-Governor of Iowa. Was in running for 2008 presidency.
• Ted Strickland-Governor of Ohio. Moderate voting record in Congress.
• John Edwards-Former senator from North Carolina. Was in 2008 presidential running. 2004 Vice presidential candidate.

Barack Obama
• Tim Kaine-Governor of Virginia. Democrat who ran as a moderate, won in state that traditionally votes more Republican.
• Kathleen Sebelius-Two-term Kansas governor. Won in a red state. Would help balance the ticket, as a woman and grab white-women voters.
• John Edwards- Former senator from North Carolina. Was a 2008 presidential running. 2004 Vice presidential candidate.

Republican-

John McCain
• Mike Huckabee-Was in 2008 presidential running until a week ago. Strong among conservatives.
• Mark Sanford-Governor of South Carolina. Appeals to fiscal and social conservatives.
Tim Pawlenty-Governor of Minnesota. Would get support from voters in the mid-west