My claim-centered approach to arising-under jurisdiction fully embraces the three subcategories of jurisdiction that Professor Mulligan identifies. My essential point is that the bifurcation (or trifurcation as Professor Mulligan suggests) into separate doctrines has led to a mechanical jurisprudence that is sometimes inconsistent with the fundamental principles that ought to animate § 1331 jurisdictional analysis. In my view, Gully v. First National Bank illuminates those fundamental principles by focusing on the role of the federal issue in the case before the court. That does not mean that Gully provides an easy answer for all applications of arising-under jurisdiction; it does mean, however, that Gully points to the fundamental question presented in the jurisdictional analysis
