Former GOP Rep. Mike Rogers has opened up a small cash advantage over his Democratic rivals in Michigan’s open Senate race as they battle through a competitive primary. But he hasn’t taken full advantage of the hard-fought contest on the other side to build a big financial edge.

Rogers raised $2.2 million over the first three months of the year and began April with $4.2 million in cash on hand, according to his federal campaign finance filing.

It’s a small cushion, however, especially considering that he has no serious primary competition, with two of his three Democratic potential opponents outraising him for the quarter.

State Sen. Mallory…

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