National Democrats have asked the Federal Election Commission to investigate whether Arizona Sen. John McCain violated campaign finance laws when his campaign paid to run ads for Republican House candidates in Arizona — charges the McCain campaign said are “baseless.” The Democratic Congressional Campaign Committee filed a FEC complaint Tuesday against McCain and his campaign committee, Friends of John McCain, because of recent ads backing Ruth McClung, the GOP nominee in Arizona’s 7th District, and Jesse Kelly, who is running in the 8th District. The complaint also asks the FEC to investigate whether McClung, Kelly and their respective campaign committees...