This would be bad news for any presidential candidate, but it’s particularly problematic for Bernie Sanders because he just turned 78 years old and is the oldest person in the field.

Sen. Bernie Sanders, 78, was hospitalized Tuesday night in Las Vegas.

“During a campaign event yesterday evening, Sen. Sanders experienced some chest discomfort. Following medical evaluation and testing he was found to have a blockage in one artery and two stents were successfully inserted,” said Sanders’ senior adviser Jeff Weaver on Wednesday in a statement.

It comes on the heels of his campaign announcing an almost astonishing third quarter haul of $25.3 million. His polls have been stagnant in recent months, but he’s still well-placed to compete and even win some early contests. He may recover quickly and resume his campaigning but this has reminded people of his age and undercut his efforts to project good health.

Given his overall position in the campaign and his ability to raise money, I doubt he will drop out. But it’s not impossible that he’ll decide to look after his health first or conclude that this is just one difficulty that he can’t politically overcome.

If this were this to happen, I believe it would probably ensure that Elizabeth Warren becomes the Democratic Party’s nominee for president. There is some limited data to support my supposition. A FairVote.org online poll from a few weeks ago used ranked choice voting. When the candidates were culled down to Biden, Sanders and Warren, and Sanders came in third place, his votes were reassigned. After that adjustment, Warren moved from second place to first place in the survey. There have been other poll results supporting the idea that Warren does very well as a second choice compared to both Biden and Sanders, and I think it’s somewhat safe to predict that she would gather up a strong plurality if not a majority of Sanders’ support if he dropped out.

The latest batch of polls suggest that Warren might be able to beat Biden even with Sanders still in the race, and I think she’d move strongly ahead if Sanders were no longer an option.

If I have any uncertainty about this, it’s related to two factors. One is that Biden would get some benefit from being in a one-on-one matchup rather than a two-on-one matchup. While the most obvious factor here is that the left is currently splitting their votes between Warren and Sanders, the two of them are also amplifying each other’s criticisms of moderates like Biden. On net, Biden would suffer against a more united left, but the effect could be less than anticipated.

The second factor is that I don’t know how Democratic voters will respond to the president’s attacks on Joe and Hunter Biden as the impeachment process barrels forward. Some may be convinced that Trump is serious when he says he wants to run against Biden and believe that Biden is vulnerable in a general election matchup due to the Ukrainian controversies. Others will rally to Biden’s defense and perhaps consider him as a top choice when they otherwise would have gone for someone else. I can’t predict how that will all wash out. It could be that it cancels out and has no discernible effect at all.

I wish Bernie Sanders good health and a swift recovery. I expect that he will continue on if at all possible. But I do think he chances are diminished because of this scare. If I were on Biden’s team, I’d be nervous about this development regardless of what Sanders chooses to do going forward.