RICHMOND, Va. (AP)- Virginia’s legislative elections are the marquee warmup for the 2020 election cycle as both parties and their deep-pocketed allies look to refine their messages, fundraising and ground game.

This year’s election has the added importance of determining who gets to oversee the next redistricting, which will determine legislative and congressional maps for the next decade.

Several 2020 Democratic presidential hopefuls have made stops in Virginia and more are expected before Election Day. GOP megadonor Richard Uihlein recently gave $500,000 to a single Republican House candidate.

Only four states have legislative elections this year and purplish Virginia is the only one where partisan control of the statehouse is up for grabs. On top of that: A new court-ordered legislative map radically shifted the partisan makeup of several once-safe Republican seats.