By Gregory Krieg

Sen. Bernie Sanders will campaign for Democratic candidates across the country this month at more than 15 planned events in nine states -- including a number of presidential primary hot spots.

The pre-midterm-election blitz begins on October 19 in Indiana, where the Vermont independent will stump in Bloomington for Liz Watson, who is trying to unseat Republican Rep. Trey Hollingsworth, and ends October 27 in Oakland, California, with a rally for Rep. Barbara Lee, a longtime progressive stalwart who could join the House Democratic leadership next year.

In between, Sanders is slated to hit the ground in a series of key 2020 primary and general election states, including Iowa -- he'll make three stops there over two days for J.D. Scholten, who is challenging GOP Rep. Steve King -- and Columbia, South Carolina, for a rally with Our Revolution, the group that emerged from Sanders' 2016 presidential campaign. He will host a pair of town halls, in Iowa and Indiana, to warn against cuts to Social Security.