Final answer:
Yes, the Sixth Amendment's right to counsel in criminal cases does extend to felony defendants in state courts, as established by the case of Gideon v. Wainwright in 1963.
Step-by-step explanation:
Yes, the 1963 case of Gideon v. Wainwright established that the Sixth Amendment's right to counsel in criminal cases extends to felony defendants in state courts. Clarence Earl Gideon was charged with breaking into a poolroom and, as he couldn't afford a lawyer, he represented himself in court. Gideon filed a habeas corpus petition, arguing that his constitutional right to be represented by counsel was violated. The Supreme Court agreed with Gideon, holding that state courts must appoint attorneys for indigent defendants who cannot afford their own representation.