What to watch in Tuesday's elections: Trump seeks payback against Indiana Republicans who opposed him

President Donald Trump's revenge tour against dissident Republicans hits Indiana's primaries on Tuesday, as he and allies try to unseat seven Republican state senators who voted last year against a Trump-backed congressional map

President Donald Trump's revenge tour against dissident Republicans hits Indiana's primaries on Tuesday, as he and allies try to unseat seven Republican state senators who voted last year against a Trump-backed congressional map.

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Those races are the highest-profile primaries in a slate of contests across Indiana and Ohio. While voters in Indiana will decide whether to punish those lawmakers for frustrating Trump's effort to pad the GOP's slim margin in the House, other primaries will set the stage for key battleground general elections this fall.

Here's a look at what to watch for in those primaries, as well as in a special legislative election with major implications for the balance of power in Michigan, a key swing state.