Assuming a Bard (of course) sure you can.
Nothing prevents it.
"Once you select a class-specific multiclass feat, you count as a member of that class for the purpose of meeting prerequisites for taking other feats."
This is a true statement, but note that taking a second Warlord multiclass feat does not have a prerequisite needing a class, so no problem.
Basically, "...you count as a member of that class..." can only work in your favor.