Republicans seem to view Francesca Hong as their weakest opponent in a general election. They are spending $2.2 million in an apparent attempt to aid her primary campaign.

A super PAC tied to Republicans is spending $2.2 million on television advertisements that appear to be aimed at boosting the chances of Francesca Hong, a Democratic candidate for governor in Wisconsin.

Some Democrats in the state have fretted over the prospect that Ms. Hong, a democratic socialist with unabashedly left-wing views in a distinctly purple state, might advance out of a crowded August primary — and then deliver the governor’s mansion to Representative Tom Tiffany, the likely Republican nominee, in November.