Sen. John McCain on Tuesday became one of the highest-profile Senate Republicans to say that his party could take control of the upper chamber in the midterm elections. In an interview on the "Imus in the Morning" show, McCain (Ariz.) criticized President Obama on national security issues and said that if Republicans win the Senate, he would become chairman of the Armed Services Committee and could further influence the debate. "I thought the important thing is, particularly on national security issues, but other issues — I think I have a lot to contribute. If we, and I think we can,...