The Democrats’ top targets are Maine, North Carolina and Iowa. In all three races, incumbent Republicans appear to be weighed down by the unpopularity of Trump, while their Democratic opponents could benefit from high turnout among voters who wish to see Trump defeated.
Democratic challengers in two states, Arizona and Colorado, appear to have a good chance in defeating Republican incumbents, while only one Democratic incumbent, in Alabama, looks especially vulnerable, according to the latest forecast from the Cook Political Report.
The number of additional seats the Democrats need to win for a voting majority depends on who wins the White House, since any Senate tie of 50-50 is broken by the sitting vice-president. If Trump wins re-election, the Democrats probably need three states, in addition to Arizona and Colorado, for the majority; if Biden wins, the Democrats probably need only two more.
https://www.theguardian.com/us-news/2020/oct/19/us-senate-elections-key-races
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