Do Mountain Bluebirds ever show up in the mid Atlantic states?

I live in Maryland, and I swear I saw a Mountain Bluebird in my yard this spring, but as near as I have been able to find out they live farther out west as a rule. It definitely wasn’t the typical Eastern Bluebird we usually see, it was blue all over, chest and all, I have never seen such a vivid blue bird before. It looked really similar to the Mountain Bluebird, so I was wondering if they ever wander off the path during migration, or maybe stop occasionally in these parts on their way to their normal habitat? If not a Mountain Bluebird, what other bird would match that description in the Potomac River region? If you have an idea for another bird it might have been, a link to a photo would be appreciated. Thanks for your answers in advance.
Hi Michael, one of your links also led to a link for an Indigo bunting. That looks more like what I saw, I think, I’ve never seen one before. Thanks for answering

I would check the Blue Grosbeak because they do breed in your area.

http://nationalzoo.si.edu/ConservationAndScience/MigratoryBirds/Life_History/default.cfm?id=150

http://www.allaboutbirds.org/guide/Blue_Grosbeak/id

http://faculty.ncwc.edu/MBrooks/pif/Bird%20Profiles/blue_grosbeak.htm

Birds can blown off course or get lost so it is possible to see a bird far outside it’s home range.
I once saw a scissor tailed flycatcher in Massachusetts in the summer.
It normally breeds in Texas and Oklahoma

So anything is possible.
But you should be able to tell a grosbeak from a bluebird by the shape of the bill

Wonderful bird migration-hundreds of birds

The Northern Black Swift: migration path and wintering area revealed.(Report): An article from: The Wilson Journal of Ornithology $9.95 This digital document is an article from The Wilson Journal of Ornithology, published by Wilson Ornithological Society on March 1, 2012. The length of the article is 5076 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.From the author: Winter ranges ha…