As Rick Santorum's slipped a little in Ohio, he's slipped a lot nationally. And while he and Mitt Romney continue to tear each other down, they're not hurting President Obama -- he's polling even with an unnamed Republican candidate in Georgia. Here's our guide to today's polls and which ones matter:
Findings: Romney is ahead of Santorum nationally by 16 points -- 38 percent to 22 percent. Way way back in ancient history (February 20), Santorum led Romney nationally by 10 points.
Methodology: Interviews of 1,211 Republican and Republican-leaning registered voters from February 29 to March 4.
Why it matters: Newt Gingrich was called a "double Lazarus" for his multiple comebacks, but Romney's managed to beat back every candidate who briefly polled ahead of him. Maybe Romney should be called a "double Lazarus" or a "triple Lazarus" or a "Lazarus times 11." If Santorum doesn't win in states where he's favored Tuesday, like Ohio, and he doesn't have the lead nationally, what's his argument for staying in the race?
Caveat: An NBC News/ Wall Street Journal poll has Romney only 6 points up. Plus, Romney's started doing more town halls, which means more chances to talk unscripted -- which means more chances to mention firing people and Nascar team-owning pals.