DEARBORN, Mich. (AP) — The Democratic presidential primary is down to two major candidates, and it shows. Former Vice President Joe Biden and Vermont Sen. Bernie Sanders are spending their first weekend as their party’s last top White House contenders increasingly taking aim at one another. Each wants to show he’s the best choice before six more states — Idaho, Michigan, Mississippi, Missouri, North Dakota and Washington — vote on Tuesday. It reflects the new contours of a race that once featured 20-plus Democrats. An increasingly bitter matchup could endure for months as Biden and Sanders compete for the right to face President Donald Trump in November. Campaigning in St. Louis, Biden took a number of veiled swipes at Sanders, even as he called on Democrats to rise above Trump’s division.