As Democratic chances of taking back the House improve with the success of Donald Trump and Ted Cruz, party strategists are trying to figure out exactly how and where it’s going to happen. It’s not too difficult to see Democrats gaining 10, or even 20, seats in November, but gaining the 30 required for a majority is more difficult and will require Democrats winning a large swath of seats where Republicans are currently heavy favorites.

Winning the House majority is more than focusing on the presidential margin and allotting House seats to Democrats because of the strength of some GOP incumbents. For example, Democrats are not going to defeat Republican Rep. Frank A. LoBiondo this year, even though President Barack Obama won New Jersey’s 2nd with 54 percent, or win New Jersey’s 3rd (which Obama won with 52 percent), where wealthy GOP Rep. Tom MacArthur could easily outspend any challenger.

In order to take advantage of a potential presidential wave, Democratic operatives are cutting emotional ties from some rural areas that made up their previous majority, such as downstate Illinois and parts of Ohio, to focus on more suburban districts, where they believe changing demographics are moving seats into the Democratic column.

In order to win the majority, Democrats likely need to win a clear majority of a batch of 16 seats, which includes pricey plays, scenario seats, late bloomers, and slippery targets.

These are not the most likely districts to flip partisan control. Democrats need to win virtually all of the seats they are currently favored to win, the pure toss-ups, and some Lean Republican seats.