It appears that I have missed the press release from Darin Bailey announcing his candidacy for the Republican nomination for Governor.
The following press release arrived on the letterhead you see below;

It pretty much says Bailey is running for Governor.
Here is the release:
Darren Bailey to Gov. Pritzker: Stop lying about State’s budget woes
Louisville, IL — Darren Bailey today called the anti-Trump rhetoric in Governor Pritzker’s Executive Order compelling state agencies to find at least 4 percent in cost cuts a work of fiction.
Bailey is issuing the following statement:
“Republicans have long called for financial sanity in Illinois,” Bailey said. “
“The first budget Pritzker signed into law was a $40.6 billion budget.
“That number has increased by $15 billion in just seven years.
“To blame President Trump for Illinois’ budget problems is like blaming the White Sox’s losing record on the fans.
“It is absurd.
“Real leaders take responsibility for their actions.
“The budget problems facing our state are a direct result of the Governor setting new spending records every year he has been in office.
“As Governor, I will bring transparency and accountability to the budgeting process and instead of wasting time applying blame, I will work on the solutions taxpayers in our state deserve.
“The money being spent at the state level belongs to the people. It is time taxpayers had an advocate for them serving as Governor of the state.”
