Most state ethics codes for attorneys require attorneys to zealously pursue and defend their clients rights, which would naturally include proper research. Further, an attorney generally has a duty to knowingly represent his client or not take the case. Violations of this codes can lead to suspension and even disbarment. For an ethical violation you can contact the state bar association or supreme court to file a complaint against an attorney.
Malpractice claims could provide damages to you for losses you suffered as a result of the attorney's failures. You will need to have an attorney file this case for you.
PLEASE NOTE: Responses here are for information/education only, NOT legal advice and do not form attorney-client relationship! Only licensed attorneys you hire in your state can provide legal advice.