A top Democratic opposition research group says it won't go after Marco Rubio — but why?  —  After an early career as a conservative operative dedicated to bringing down Bill Clinton, David Brock has emerged as one of the top guys in the world of Democratic-aligned fundraising, messaging, and opposition research.

Trump expecting shots from Cruz  —  Donald Trump predicted in an interview on Sunday that his cordial relationship with Sen. Ted Cruz (R-Texas), a fellow GOP presidential candidate, will likely come to an end soon.  —  “He's been so nice to me,” Trump said on CNN's “State of the Union.”

Who's in Tuesday's debate?  CNN doesn't say  —  Despite touting that they would reveal the field for Tuesday's GOP presidential debate on their signature, weekly political show, CNN ended “State of the Union” Sunday morning without an announcement about which candidates will be in the main debate in Las Vegas.

Trump Leads National GOP Horserace, Cruz Surges Into 2nd Place  —  Donald Trump has moved back into the lead of the 2016 Republican presidential contest, while Ted Cruz has surged into second place, according to a new national NBC News/Wall Street Journal poll.

Cruz Soars to Front of the Pack in Iowa Poll; Trump Support Stays Flat  —  Bloomberg Politics/Des Moines Register Iowa survey also brings no joy to Ben Carson or Jeb Bush.  —  McCormickJohn  —  Republican presidential candidate Ted Cruz has surged ahead to become the latest front-runner …

How Well Do You Know Religion?  —  Donald Trump's proposal to bar Muslims from America may be a gift to ISIS recruitment and a grotesque echo of the sentiment behind the Chinese Exclusion Act and the internment of Japanese-Americans.  But, like those earlier spasms of exclusion, the Trump proposal has plenty of supporters.