Still, it's a large field, meaning that a candidate could win a state's primary/caucus with 20 - 25% of the vote.
Only now the field is getting smaller, without anyone actually getting out of the race.
From Time Magazine, written by Will Lester -
Former House Speaker Newt Gingrich and Texas Gov. Rick Perry have failed to qualify for Virginia's March 6 Republican primary, a setback in their bids for the Republican presidential nomination.
Also not on the ballot, courtesy the Arlington County (VA) GOP - Michelle Bachmann, Jon Huntsman, Rick Santorum, and Gary Johnson.
That leaves Romney on the VA ballot alone with Ron Paul.
Now, Paul has a small but dedicated core group of followers in the far-right reaches of the Republican Party, but his usually extreme (even by the GOP's standards) positions make him all but unelectable in a contested general election.
His party's poo-bahs (insiders and power brokers) won't allow him to get even within sniffing difference of the actual nomination, though he may win a few primaries or caucuses.
In the end, the R nominee will be Romney, with someone like Chris Christie or Tim Pawlenty as the VP candidate.
Next November's election will be about returning Barack Obama to office, perhaps with a Congress that won't be dedicated to keeping the economy cratered for political gain, or returning to the blindly pro-greed and pro-corporate bottom line policies that got the US and world into this mess.
Note: as of this writing, Romney and Paul are the only two "major" candidates on the ballot for Arizona's Republican primary, though the others have another couple of weeks to submit their names.