Jeff Hagan offers a useful survey of the issue. He follows with some reflections on divorce and remarriage for ministers–employing a non sequitur or two. Here is his main conclusion:

If a man has to be married to hold a position in the church, then Paul would have disqualified himself which is ludicrous (cf. 1 Cor. 7:8). Some will still argue. They will say that Paul was a married man before he was widowed. Although this is true, a widower is still NOT a married man. Paul had no living wife. In fact, Paul actually considered being single better.