Two-thirds of state Republican Party chairs and members of the Republican National Committee say Sen. Rob Portman (R) is both the best and most likely veep pick for Mitt Romney. But it's still early.
Too soon to start speculating about possible Republican vice-presidential candidates? Evidently not. Mitt Romney's rise to the level of presumptive presidential nominee seems to have given political writers and pundits the go-ahead to begin one of the favored handicapping contests in all of politics.
With signs that Newt Gingrich is fading, Tuesday's three caucuses could help Rick Santorum woo anti-Romney conservatives. But many challenges lie ahead.