Running mates

Throughout the Republican presidential primary season, whenever there's talk about a short list of possible running mates, one name is nearly always at the top — Florida Sen. Marco Rubio.

Rubio has only been in the Senate for a little more than a year, but his appeal is obvious. He's a young, charismatic, conservative Hispanic.

But as his national profile has risen, he has become a target for Democrats and advocacy groups who say he doesn't represent Latino voters.