Newt Gingrich got trounced Tuesday. His plan has been built on surviving until Super Tuesday, where geography favors him more. But it's hard to see how Mr. Gingrich will be able to rebound.
Ron Paul performed strongly in Tuesday night's Minnesota caucuses. But he also finished last in Colorado and Missouri, calling into question his caucus-centric campaign strategy.
Rick Santorum has been declared the winner in Minnesota and Missouri – by wide margins – and could yet upset Mitt Romney in Colorado. But bigger contests lie ahead.
With signs that Newt Gingrich is fading, Tuesday's three caucuses could help Rick Santorum woo anti-Romney conservatives. But many challenges lie ahead.