You can but it would be considered a backup offer. Your offer would only come into play if something happened to the first, accepted offer. If for some reason the first buyer couldn't obtain financing or they backed out of the transaction then the sellers would revert to your backup offer.
Brandi Nelson, Realtor
Century 21 SRE Ames, Iowa
What is your agent advising and how far along is the first offer--you may be be able put in an offer, however it would be considered a back-up offer and entertainable if the current deal falls apart--again your agent can best advise.