Wayne LaPierre said the NRA "will not go quietly into the night."
The group is backing Shane Osborn, but Ben Sasse has racked up conservative endorsements too.
Sanders said he had not decided if he would run as a Democrat or independent.
At CPAC Rubio said U.S. is “on the verge of a new American century" but Dems are impeding it.
A new poll says only 30 percent of Arizonans approve of McCain.
Scandal-plagued governor's 2016 hopes could get a boost after well-received speech.
Jindal tells conservative crowd he was wrong to once say Carter was worse.
The former Massachusetts senator's poll numbers have declined over the past few months.
“Ignoring threats to our national security is the Obama doctrine,” the ex-ambassador said.
Despite a red meat speech, many of the GOP leader's lines fell flat.