Help get out the vote, is what you want to do. Writing blog posts and messing with social media are insufficient. Tweeting is futile. Practical examples follow.
Volunteer to staff a phone bank. Or offer to drive likely voters to the polls at their convenience. This is especially important if they are aged or have health problems and the weather is bad. If you are a shy person, you can remind people to vote by wedging brochures in the front door. More....If you really can't handle strangers, make it clear to your friends, lovers, and relatives that bagging out on the mid-term Congressional election is unacceptable and you won't take no for an answer. You have a month to get them ready and make sure they get to the right polling place. Whatever works is true.
Example tactic from...The Project Gutenberg EBook of Lysistrata, by Aristophanes
These are the very armaments of the rescue.
These crocus-gowns, this outlay of the best myrrh,
Slippers, cosmetics dusting beauty, and robes
With rippling creases of light.
Additional posts about voting.
Survey: Are You Voting This Year?
Making Climate Change an Issue in the UK Elections
Don't Have a Ride on Election Day? Carpool to the Polls!