Republican voters were presented with a list of 19 names, and a plurality, 18 percent, said Rick Santorum would be the best candidate to fill out the GOP ticket, while 17 percent went for Rubio.

Rubio was by far the most popular candidate with Tea Party supporters, and the only potential vice presidential pick to pull more than 20 percent with any of the groups represented in the poll…

But if Romney hopes to appeal to independents, Rubio performs dismally, pulling only 4 percent of their support. Santorum led among independents at 16 percent, and was followed closely by New Jersey Gov. Chris Christie and former Florida Gov. Jeb Bush (R).