Former Vice President Joe Biden is still looking good in key swing states across the country.In May, a poll from the British consulting firm Redfield & Wilton Strategies put Biden ahead of President Trump in six states Trump won in 2016: Arizona, Florida, Michigan, North Carolina, Pennsylvania, and Wisconsin. Redfield & Wilton Strategies' July poll shows Biden still has a lead in all of those states, and even widened it in three of them.While Biden had a 4 percent lead over Trump in Arizona, a 2-point lead in Florida, and an 8-point lead in Michigan in May, he has an 8, 7, and 12 percent lead, respectively, in those states as of July. Biden maintained his 10-point lead in Wisconsin over the past two months. Meanwhile Biden lost traction in North Carolina, where he had a 45-43 lead over Trump in May but has a 43-42 lead as of July, and Pennsylvania, where his margin fell from 48-39 to 48-41.Redfield & Wilton surveyed anywhere from 742 to 1,121 registered voters in each o...