Today's installment of campaign-related news items from across the country.
* Donald Trump's butler this week called for President Obama's assassination. The Secret Service is following up.
* According to Politico, a group of staffers and volunteers for Bernie Sanders' campaign has begun "circulating a draft proposal calling on the senator to get out of the presidential race after the final burst of Democratic primaries on June 7, and concentrate on building a national progressive organization to stop Donald Trump."
* On a related note, Sen. Jeff Merkley (D-Ore.), the only senator to endorse Sanders' candidacy, said this week that he's not on board with Sanders' plan to rely on superdelegates to override voters' will to win the Democratic nomination.
* Seventeen Republicans ran for president this cycle, and Ben Carson is leading an effort to convince each of them to support Trump. Two of them -- Jeb Bush and Lindsey Graham -- have already categorically ruled out the possibility.
* Senate Foreign Relations Committee Chairman Bob Corker (R-Tenn.) has reportedly begun working with the Trump campaign, hoping to help the candidate "evolve" on matters of international affairs.
* Sen. Marco Rubio (R) raised some eyebrows yesterday when he hinted he might reverse course and run for re-election after all. His office soon after said the Florida senator was kidding.
* Trump is reportedly considering Newt Gingrich as a possible running mate, though it's hard not to wonder how much of these rumors are being fueled by the former House Speaker himself.
* Unprompted, Sen. Elizabeth Warren (D-Mass.) twice this week went after Trump through social media, and both times, seemed to get under the Republican candidate's skin. The Clinton campaign noticed: the Huffington Post reported yesterday, "Multiple sources close to the former secretary of state say that her aides took note of the senator's ability to rile the real estate tycoon."