Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Office | Democratic ticket | Republican ticket | Socialist ticket | Constitutional ticket | Law Preservation ticket |
| --- | --- | --- | --- | --- | --- |
| Governor | Herbert H. Lehman | Robert Moses | Charles Solomon | (none) | William F. Varney |
| Lieutenant Governor | M. William Bray | Fred J. Douglas | Herman Kobbe | (none) | James F. Luckey |
| Comptroller | Morris S. Tremaine | Wilson R. Campbell | Fred Sander | (none) | Fred C. Foster |
| Attorney General | John J. Bennett, Jr. | William T. Powers | William Karlin | (none) | Joseph S. Robinson |
| Chief Judge | Frederick E. Crane | Frederick E. Crane | Jacob Hillquit | (none) | Frederick E. Crane |
| Judge of the Court of Appeals | John T. Loughran | John T. Loughran | Darwin J. Meserole | (none) | John T. Loughran |
| Judge of the Court of Appeals | Edward R. Finch | Charles B. Sears | Julian H. Weiss | (none) | David E. Hartshorn |
| U.S. Senator | Royal S. Copeland | E. Harold Cluett | Norman Thomas | Henry Breckinridge | William Sheafe Chase |
| U.S. Representative-at-large | Matthew J. Merritt | William B. Groat, Jr. | Charles W. Noonan | (none) | William E. Barron |
| U.S. Representative-at-large | Caroline O'Day | Natalie F. Couch | August Claessens | (none) | Dorothy Frooks |
Question:
What office was law preservation ticket holder William E. Barron running for?
Answer:
U.S. Representative-at-large