I just found a workaround using UNION to merge those two tables together. I put this in a custom query in a document type. This way it merges the column names so I can query against both tables.
For anyone else's reference, here is the query I created:
select ##TOPN## ##COLUMNS##
from (
select
ClassName, NodeID, NodeAliasPath, NodeAlias, NodeOrder, DocumentID, DocumentName, DocumentNamePath,
BlogPostID as ItemID, BlogPostTitle as Title, BlogPostDate as Date, BlogPostSummary as Summary, BlogPostBody as Body, BlogPostTeaser as Teaser, Featured
from View_CONTENT_BlogPost_Joined
union all
select
ClassName, NodeID, NodeAliasPath, NodeAlias, NodeOrder, DocumentID, DocumentName, DocumentNamePath,
NewsID, NewsTitle, NewsReleaseDate, NewsSummary, NewsText, NewsTeaser, Featured
from View_CONTENT_News_Joined
) t
WHERE ##WHERE##
ORDER BY ##ORDERBY##