314 Action, a group that backs candidates with scientific backgrounds, is launching a new effort Wednesday to encourage former astronaut and Navy veteran Mark Kelly to run for Senate in Arizona.

Kelly, who is married to former Arizona Rep. Gabrielle Giffords, is among a handful of potential Democratic challengers to appointed Sen. Martha McSally. The race is expected to be a top party target in 2020, and 314 Action is hoping a show of support will bolster Kelly’s decision to run.

The effort to draft Kelly, shared first with Roll Call, involves a “six-figure” digital ad campaign. The ads will direct supporters to draftmarkkelly.org where they can sign a petition urging him to run. The campaign will largely target Arizonans on social media platforms.

“I think we’re going to see an overwhelming level of support for Mark Kelly to run for the United States Senate,” said Joshua Morrow, the executive director of 314 Action. “Mark is probably going to be the best-situated candidate to win.”

Arizona Gov. Doug Ducey chose McSally last month to replace GOP Sen. Jon Kyl, who was himself appointed less than four months earlier to the late Sen. John McCain’s seat. McSally lost a close race to Democrat Kyrsten Sinema in November for the state’s other Senate seat. Arizona voters will decide next year in a special election who will serve out the final two years of McCain’s term.