<p>TROY, Mich. (AP) — She walks with the determination of a person who believes the very fate of democracy might depend on the next door she knocks on, head down, shoulders forward. She wears nothing fussy, the battle fatigues of her troupe: yoga pants and sneakers. She left her Lincoln Aviator idling in the driveway, the driver door open -- if this house wasn’t the one to save the nation, she can move quickly to the next.</p>