How we win

It seems clear to me that Democrats have the cities and the Republicans the rural, and you're not likely to see a change in either of those for a while.

That leaves the suburbs.

I have trouble seeing what's wrong with a strategy that builds a connection between the suburbs and the cities versus the rural. The Republicans have been doing the opposite, and to great effect, for decades.

How is it done?

One way would be to point out how monies are leaving the urban and suburban areas and going to the rural. This may not be happening everywhere, but I know it has gone on for years and years in Alabama, for instance. Targeting Republican officeholders in suburban districts with ads saying that a vote for him or her is a vote against the suburbs, and a vote for rural areas, is one way to raise the ire of suburbanites.

On a larger scale, the same tactic can be used for blue/blue-ish states versus red (and this money shift is DEFINITELY happening). "A vote for Republican Senator X from the state of X is not a vote for our state, it's a vote for Alabama. Shouldn't your tax dollars be used here?" And do it under the banner of FAIRNESS.

There are more ways to exploit those differences, some likely quite distasteful.

Such tactics would likely create even more divisiveness. But what do you want to do: win, or whine about all of us getting along?