A progressive-led campaign encouraging voters to check "uncommitted" in Michigan's upcoming Democratic primary in protest of President Joe Biden's response to Israel's war in Gaza has received a flurry of support since its launch earlier this month — and that has Democrats worried. Biden's staunch military backing of the Israeli government and its retaliatory attacks in the Gaza Strip, which have killed tens of thousands of Palestinians, has left a massive divide on the political left across the United States, sparking threats from progressives since early October that he'll lose their vote in 2024's presidential contest if he doesn't change...