In April, Joe Lieberman explained that he’s open to delivering the keynote address at the Republican National Convention in September. “If Sen. McCain, who I support so strongly, asked me to do it, if he thinks it will help him, I will,” Lieberman told The Hill. (The remarks came just days after Lieberman praised Rush Limbaugh for his “love for our country and support for our troops,” adding, “Rush has a big voice but he has heart that is even bigger.”)

At the time, the Democratic Senate leadership didn’t seem prepared to do anything about Lieberman’s antics. Asked whether Lieberman’s chairmanship was at risk in the next Congress, Majority Leader Harry Reid said succinctly, “No.”

A Lieberman aide told The Hill in May, “Sen. Reid has made it clear that the chairmanship is absolutely not in jeopardy.”

If I were Lieberman, I wouldn't count on that.