The campaign to legalize and tax marijuana for adults in Washington state is rolling as next month's vote approaches, with more than $1 million in new contributions reported since last week and a surprising endorsement Wednesday from Republican U.S. Senate hopeful Michael Baumgartner.

The money, most of it from retired Progressive Insurance founder Peter Lewis, means Initiative 502's backers have raised nearly $4.1 million over the course of the campaign, with $1.2 million left to spend. Alison Holcomb, campaign manager for New Approach Washington, says her group is planning a broader television campaign than the three-week advertising blitz it ran in Western Washington in August.