1. The National Popular Vote Interstate Compact. Or, even better, a Constitutional amendment delivering the same result.
2. Instant runoff voting. You get to rank the candidates you like. If your top choice doesn’t win, your vote is automatically cast for your second favorite.
3. Mandatory public financing of campaigns.
4. Campaigns that last two months, not two years.
5. No privately funded “issue ads” during the campaign.
6. Free television air time for all candidates on the ballot, as a condition of FCC licensure.
7. Presidential debates put back in the hands of non-partisan organizers.
Except those dealing specifically with presidential elections, these ideas can probably work for US senate and house elections, too.