A conservative political science professor says a Democrat's recent retirement announcement is the latest indication that the GOP is poised to take control of the Senate this fall.

Senator Ben Nelson survived nearly two decades representing Nebraska, which has been a Republican state for the most part. But the Democrat recently announced he would not seek a third term, swinging the door wide open for the GOP, which only needs to net four seats to take back the Senate this year.

Dr. Charles W. Dunn, distinguished professor of government at Regent University, thinks the Democrats are in trouble.

"The Democratic Party recognizes that it's going to have difficulty defending all of those seats that it holds," he comments. "They have 23 seats to defend, and Republicans have only ten seats to defend."

And whenever a Democrat retires, Dunn points out that that creates an open seat...